In 2013, radio waves from deep space are picked up by scientists, proving the existence of extraterrestrial life. The Earth Defense Force, a unified multinational military sponsored by nearly every country, is founded a few years later, in case the aliens prove to be hostile. In each of the games the player assumes the role of an EDF soldier during an alien invasion.

Description

It's a fight for the future of the planet between the Ravagers, a
merciless swarm of alien invaders, and the Earth Defense Force
(EDF) in this third-person shooter. As an EDF soldier you will go
head to head in fierce combat against the hordes of giant alien
insects and their slaughtering machines. Play as four different
classes in over 80 missions with a range of 800 weapons at your
disposal.